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OpenStudy (anonymous):
when solving the system x+2y=9 and x-y=6, which expression could be substituted for x in the second equation? a.9=x b.y-9/2 c.9-2y d. 1/2y+9
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OpenStudy (y2o2):
c.9-2y
OpenStudy (anonymous):
wouldnt it be b?
OpenStudy (y2o2):
You want to substitute for x not y
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